Date: Wed, 17 Mar 2021 19:32:53 GMT From: Richard Scheffenegger <rscheff@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 703419774f86 - stable/13 - fix panic when rescue retransmission and FIN overlap Message-ID: <202103171932.12HJWrBH021530@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch stable/13 has been updated by rscheff: URL: https://cgit.FreeBSD.org/src/commit/?id=703419774f86525a2441d615733993a6fddcd047 commit 703419774f86525a2441d615733993a6fddcd047 Author: Richard Scheffenegger <rscheff@FreeBSD.org> AuthorDate: 2021-03-17 15:44:29 +0000 Commit: Richard Scheffenegger <rscheff@FreeBSD.org> CommitDate: 2021-03-17 19:05:33 +0000 fix panic when rescue retransmission and FIN overlap PR: 254244 PR: 254309 Reviewed By: #transport, hselasky, tuexen Approved by: re (cperciva) MFC after: immediately Sponsored By: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D29315 (cherry picked from commit e9f029831fa5747ae1b405f5716c52cb4ebf1e04) --- sys/netinet/tcp_sack.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c index 37db30007580..f8d983da723b 100644 --- a/sys/netinet/tcp_sack.c +++ b/sys/netinet/tcp_sack.c @@ -831,8 +831,18 @@ tcp_sack_partialack(struct tcpcb *tp, struct tcphdr *th) (tp->snd_recover == tp->snd_max) && TAILQ_EMPTY(&tp->snd_holes) && (tp->sackhint.delivered_data > 0)) { - struct sackhole *hole; - hole = tcp_sackhole_insert(tp, SEQ_MAX(th->th_ack, tp->snd_max - maxseg), tp->snd_max, NULL); + /* + * Exclude FIN sequence space in + * the hole for the rescue retransmission, + * and also don't create a hole, if only + * the ACK for a FIN is outstanding. + */ + tcp_seq highdata = tp->snd_max; + if (tp->t_flags & TF_SENTFIN) + highdata--; + if (th->th_ack != highdata) + (void)tcp_sackhole_insert(tp, SEQ_MAX(th->th_ack, + highdata - maxseg), highdata, NULL); } (void) tp->t_fb->tfb_tcp_output(tp); }
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202103171932.12HJWrBH021530>